Well, in fanfiction, Lockhart might be depicted as having a more powerful or dangerous form of magic that Harry doesn't understand. Harry, being young and still learning, could be intimidated by this unknown aspect of Lockhart's abilities. Also, Lockhart's popularity among some in the wizarding world might isolate Harry further, as he might feel that Lockhart has the upper hand in some social or power - related ways within the school environment, and that could lead to fear.
One possible reason could be Lockhart's over - the - top self - promotion. In the original story, Lockhart is constantly boasting about his achievements which are actually false. In fanfiction, this could be exaggerated, making Harry see him as an untrustworthy and annoying figure, thus causing fear. Another reason might be that Lockhart could be portrayed as having some hidden and sinister motives in fanfiction, which Harry senses and is afraid of.
It could be that he has a premonition of something bad happening in water. Like he might have seen a vision of a dangerous water creature waiting for him whenever he gets close to water.
One possible reason could be past trauma. Maybe he had a bad experience in his childhood, like being bullied or physically hurt by someone. Another reason might be related to his magical abilities. He could be afraid that being touched might somehow disrupt his magic or cause an unexpected magical reaction.
Well, it could also be that Bellatrix is simply bored with the reality of her world in the Death Eater realm. Fanfiction provides an escape into a different world where she can interact with Harry in ways that she may not be able to in the official story. It gives her a chance to be part of new and exciting (to her) adventures that revolve around Harry, even if they are just fictional interpretations created by fans.
One reason could be that she has seen his courage and selflessness. Harry is known for his heroic deeds, and Daphne might admire these qualities and thus want to protect him. Just like how people often feel the need to protect those they look up to.
Perhaps there is a political reason. Some powerful pure - blood families might be trying to strengthen their influence by uniting the Potter and Malfoy families through this marriage, even if it's by force. Another possibility is that there is a prophecy that they misinterpreted which led them to force this marriage.
One possible reason could be that he's wrongly accused of a serious crime, like using dark magic. In the wizarding world, such accusations can lead to expulsion. Another reason might be that he's framed by a powerful enemy who wants to get him out of Hogwarts. For example, a Death Eater could plant false evidence against him.
Another possibility is that he discovers some dark secrets about his family or his past. These secrets could shatter his perception of himself and his loved ones. It could make him question everything he has known and believed in. For instance, if he finds out that his father was involved in some immoral deeds in the past, it would be a huge blow to him and result in his sadness.
In the fanfiction's world - building, there could be a cultural or religious group in the wizarding community that Harry has become a part of, and they have a strict no - meat diet. This newfound identity or connection has led to him not being able to eat meat.
One possible reason could be a plot device to create drama. Maybe the author wants to show a rift between them for the sake of a more complex storyline. For example, if there's some misunderstanding or a secret that has come to light which makes Harry act this way.
One possible reason could be a divergence in the characters' personalities as portrayed in the fanfiction. Maybe the writer made Molly have traits that Harry would realistically dislike. For example, if Molly was written as overly controlling or mean-spirited towards Harry in the fanfic.